Kernel memory leaking' Intel processor design flaw forces Linux, Windows redesign

Discussion in 'Frontpage news' started by zero_cool, Jan 2, 2018.

  1. scatman839

    scatman839 Ancient Guru

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  2. pegasus1

    pegasus1 Maha Guru

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    They will find a way, they always do, remember the line "Its impossible to code games to use more than a single core".
     
  3. __hollywood|meo

    __hollywood|meo Ancient Guru

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    not too surprising. the patch impacts I/O heavily.
     
  4. Turanis

    Turanis Ancient Guru

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    Jagman and Silva like this.

  5. Kaarme

    Kaarme Ancient Guru

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    Somebody should benchmark that latest Assassin's Creed after the patch. Doesn't it use a VM for its paranoid schizophrenic copy protection?
     
  6. Turanis

    Turanis Ancient Guru

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    Yes,2 in 1 DRM protection.
     
  7. H83

    H83 Ancient Guru

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    OK i understand that his is really bad but i have a question: this flaw/bug only affects people running virtual machines or affects anyone that´s using an Intel CPU??? If it´s the latter than that´s a problem for me because i´m running W7 and i´m not expecting MS to patch it...

    It seems Intel want´s me to go with AMD next time i build a new rig...
     
  8. mbk1969

    mbk1969 Ancient Guru

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    I think you do interpret "virtual" wrong. All processes run in virtual machine, every process "thinks" that it runs exclusively on computer, having all CPU, RAM, keyboard and mouse - all hardware for itself only.

    And to me when OS kernel should get security patch for CPU flaw means bad design of OS kernel.
     
  9. Evildead666

    Evildead666 Maha Guru

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    The more i'm reading about, the more I see mentioned Virtual Memory, not just Virtual Machines.

    So basically, every Intel CPU would be affected, and need to be patched, but not everyone would get the slowdown due to it being only in specific cases.
     
  10. k3vst3r

    k3vst3r Ancient Guru

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    Performance impact is big on NVME SSD's. 50%+ performance reduction.

    "In some of Phoronix's I/O based benchmarks we can see that system performance is impacted on both their i7 6800K and i7 8700K based systems. It must be noted that the 6800K-based system is using a SATA SSD while the 8700K-based system is using a Samsung 950 Pro M.2 NVMe SSD, explaining why its performance is hit hardest.

    The performance degradation here is astounding, showcasing exactly how much these changes can affect the performance of certain applications. Given the fact that these are synthetic benchmarks, the real-world performance impact of this kernel patch is expected to be lower for consumers, though it does highlight how bad the problem can be."

    https://overclock3d.net/news/softwa...mpacting_security_update_have_been_released/1
     

  11. BlackScout

    BlackScout Member

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  12. D3M1G0D

    D3M1G0D Ancient Guru

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    Wow, that performance hit is insane! If I was a data center operator, I would be extremely worried about the impact this could have on my business. To say that Intel massively screwed up would be a severe understatement. Little wonder why AMD stock is shooting up.

    Also, since this is a hardware bug in their current design, it's likely that upcoming CPUs would also be affected (e.g., Ice Lake). Otherwise, they'll need to quickly do a redesign to avoid this issue, which will cause delays. No real positives here.
     
  13. Ryu5uzaku

    Ryu5uzaku Ancient Guru

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    Don't worry it's all the core cpus. Intel might fix it hardware wise in some future cpu.
     
  14. DeskStar

    DeskStar Master Guru

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    Sooooooooo going GPU accelerated in your servers has seems/sounds like a better approach as more and more time goes on. Not only are they faster, but could they be more secure!?!
     
  15. AsiJu

    AsiJu Ancient Guru

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    Yep, article refers to virtual memory address space. Actually I don't think it was stated anywhere that this would affect VMs only or in particular.

    Problem being that this flaw could allow exploiting speculative execution to access kernel mode address space from user mode processes.
    So the actual issue is that (based on current belief) Intel CPUs speculative execution does not check for such violations (as user mode process trying to access kernel mode addresses) before execution.

    Ofc one cannot directly run such code but if Intel CPU "guesses" such code would be run then it will execute such code.

    Again, that's what I got from the article and the article is based on speculation (based on the fact Linux patch separates user mode and kernel mode address spaces).

    edit: typos
     
    Last edited: Jan 4, 2018

  16. Alessio1989

    Alessio1989 Ancient Guru

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    This is not going to be fixed with microcode in a easy way. Disabling TLB would be worst.
    GPU GUI acceleration has nothing to do with this. Actually accelerating the GUI with the GPU will cause more context switch to kernel than a software rendering.
     
  17. Aura89

    Aura89 Ancient Guru

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    ....lol?

    That was meant as a joke, right?

    I mean, it must have been. There's literally no way possible someone could have that mindset....
     
  18. mbk1969

    mbk1969 Ancient Guru

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    Why? If this flaw was with us for years and our rigs were not suffered from any sort of breach then problem with this flaw is not worth a loss in performance for home users. I would prefer to decide whether to install that patch with fix for myself (as well as other things in OS).
     
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  19. Evildead666

    Evildead666 Maha Guru

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    I think the whole point is that the fix, won't impact most users either. ;)
     
  20. mbk1969

    mbk1969 Ancient Guru

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    Regardless of that I prefer to decide for my home rig.

    If performance loss is originated namely in changes in transitions from user code to kernel code (and back) then the impact should be bigger for apps which do huge amount of kernel code calls. For example SSD/HDD benchmark apps - essentially all they do is calling kernel code for read-write operations.
     

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